回転翼機の振動低減のための重心移動の補助的代替案についての一考察

抄録

The reduction of N/rev vibration of rotorcraft can be accomplished using the CG offset. It is desirable if lateral CG offset is movable, and by considering the difficulties of moving CG laterally, the cant rightward of a main rotor shaft has been proposed in this paper. Moving the CG longitudinally is easier than doing so laterally, but it is still also preferred to have an alternative way. Here, the negative horizontal stabilator setting angle was introduced to have the effective moment on a main rotor hub. The vibratory forces and moments acting on the main rotor hub were obtained using CAMARD II, then the acceleration of pilot seat position was calculated. The results showed the cant of a main rotor shaft could be an alternative way to supply a shortage of the required lateral CG offset however, the negative horizontal stabilator produces a large negative lift that eliminates the increase of fuselage lift force, which results in the slight increase of the 4/rev F_z force.